Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f8559ee682a4c0…

MALICIOUS

PDF

89.6 KB Created: 2021-08-17 06:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe2fb164a17e3cc59a432b6036c4b43a SHA-1: c7d8360e72b2d46322d42bb65fcceae453c516bb SHA-256: b3f8559ee682a4c04b42a7c83d367e84066e20c2d83c53f02103852d2465bf93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms, suggesting a phishing or content-scraping lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and the overall structure points towards a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=how+to+mine+bitcoin+online+free PDF link annotation
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e83nsnmnqhei270emhncqk4oo2/kagivedesesezijopowe.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/mezedip.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9j14d000qd7t4v68ci9atir53a/82962947251.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/24757591854.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/nisodipipawa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772fe3ebfd0---21370850971.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b18f9ee40ca---dubupowaxaz.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/resiwupeposiviteta.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe84663e8---34423297162.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/21056583178.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f9c43f95982589f6fce8cdffd5854ce8/viriditu.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b3151087---69073022524.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/purimovojuk.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/af167d6fb88bebc2694affa8c010463b/zafuvevumorode.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce8d083c9---21309150170.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17c65ae4b---35637527392.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/81b77af84498fde60eb3e58af4cec137/38387022058.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/nabibajuvunafufotijel.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/nubofewokalebijogebad.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/91453129458.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/203fbd60b4fa559232b37d6abc87cff9/90995673559.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/15063376858.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 17740 bytes
SHA-256: 3bd0d4c1b95cf0da78606ec1c0cfc9a646179501d6258c8e82cefb274c47c23f
font_01_sfnt_off0001299d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B4 10384 bytes
SHA-256: 804671afa189a8bf1a05ef5e52bcfd8ce59de271620e035669f59bf04fb28c0b

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